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20202
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Subject: Horticulture × End date: 2020 × Start date: 2020 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    EFFECT OF GROWTH REGULATORS ON ASSAM LEMON (Citrus limon L)
    (2020-07) Bakhtari, Wahedullah; Kotoky, U.
    An experiment was conducted on Assam Lemon (Citrus limon L.) at the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat during 2018-2019 to study the “Effect of growth regulators on Assam Lemon (Citrus limon L)”. Six treatments with four replications were laid out in a Randomized Block Design. The treatments comprised of GA3 (60, 80 and 100ppm) and NAA (30, 40 and 50ppm). The growth regulators were applied as foliar spray at three growth stages: (1) at pre flowering stage in the month of November, 2018, (2) at flowering stage and (3) one month after fruit set. The plant growth regulators showed significant response on flowering. The minimum number of days (52.67days) was recorded in T2 (GA3 80ppm) from the date of plant growth regulators application and the highest number of days were required in case of T6 treatment (NAA 50ppm). The highest number of flowers per plant (476.74), highest fruit set (81.32%) and the lowest fruit drop (18.50%) was recorded from T2 (GA3 80ppm) during the experiment. Number of fruits per plant was recorded highest in GA2 80ppm (371.33) and the lowest in T6 (NAA 50ppm). The highest fruit weight (136.53g), fruit length (10.00cm), fruit girth (15.93 cm), fruit volume (162.89cc) and yield (52.72 t/ha) were recorded in T2 (GA3 80ppm) while the lowest values were recorded in T6 (NAA 50ppm). The results revealed that, pulp weight and pulp-peel ratio were significantly influenced by growth regulator applications. The highest pulp weight (108.32g) and the highest pulp-peel ratio (4.83) were recorded in T2 (GA3 80ppm). Peel thickness was lowest (0.48cm) in T2 (GA3 80ppm) and the highest of 0.73cm was recorded in T6 (NAA 50ppm).The results revealed that, T2 (GA3 80ppm) took the lowest number of days required for flowering to harvesting (102.47 days) and the highest (133.77 days) in T6 (NAA 50ppm). Regarding the total leaf chlorophyll content, the highest was recorded (1.29mg/g of fresh weight) in T2 (GA3 80ppm). However, there were no significant differences in leaf nitrogen and leaf phosphorous among the treatments. Highest leaf potassium (1.69%) was recorded in T1 (GA3 60ppm). The highest juice content (37.29cc) was recorded in T2 (GA3 80ppm). The highest TSS (5.18°Brix), titrable acidity (3.50%) and TSS-Acidity ratio (1.48) was recorded in T1 (GA3 60ppm), whereas, the lowest values were recorded in T6 (NAA 50ppm). From the results of the ascorbic acid content (32.15mg/100ml) the highest was recorded in T2 (GA3 80ppm). Regarding evaluation of the economics of cultivation, it can be concluded that, the highest benefit-cost ratio of 3.52 was obtained from T2 (GA3 80ppm) followed by 3.44 from T1 (GA3 60ppm). The lowest B:C ratio (2.41) was recorded in T6 (NAA 50ppm). Thus, it can be suggested that, GA3 at 80ppm is the most economical plant growth regulator to improve flowering, yield and quality of Assam Lemon.
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    ThesisItemOpen Access
    GROWTH PERFORMANCE OF SOME GLADIOLUS CULTIVARS IN PAIRED ROW SYSTEM
    (AAU, Jorhat, 2020-10) BARUAH, ROCKTIM; Bora, Sunil
    A field experiment entitled “Growth performance of some gladiolus cultivars in paired row system” was undertaken with the objectives to study the performance of gladiolus cultivars in paired row system, to find out the suitable cultivars of gladiolus for cut flower production, to study the multiplication behavior of the cultivars under study and to evaluate the economics of cultivation. To achieve these objectives, seven treatments or cultivars (Friendship, Candyman, White Prosperity, Novalux, Priscilla, Summer Sunshine and Dull Queen) were considered and the trial was carried out at the Experimental Farm, Department of Horticulture, Assam Agricultural University during 2019-2020. Different characters relating to vegetative growth, flower and corm and cormel were assessed to identify suitable cultivars under paired row system. The cultivars White Prosperity, Novalux and Candyman were better performers during the vegetative phase where White Prosperity was superior in early shoot emergence (5.566 days) and plant height (160.620 cm), Novalux was superior in shoots per corm (1.867) and Candyman in terms of number of leaves (8.33). In respect to flower characters, variety Priscilla performed better in terms of early spiking (65.33 days) and first floret opening (78.55 days), spikes per corm (1.733), self life (15.267 days) and vase life (10.733 days). While White Prosperity was superior in certain critical flower characters like florets per spike(16.400) and florets open at once(6.733), rachis(81.827 cm) and spike length(103.587 cm) and size of florets(10.673 cm). The multiplication of corms (2.400) and cormels (47.267) was highest in Dull Queen while size of corm (9.060 cm) and weight of corm (212.133 g) and cormels (20.091 g) was highest in Novalux variety. In the economic aspect, Priscilla cultivar showed good remunerative quality with highest BC ratio (1:2.4). Hence cultivars White Prosperity, Priscilla and Novalux can be concluded as suitable varieties for cultivation under paired row system.